Double-lock screw cap



Mar. 3, 1925.

A. PODEL DOUBLE LOCK SCREW CAP FiLQELM b' 1923 INVENTOR ATTORNEY Patented Mar. 3, 1925.

UNITED STATES ABRAHAM PODEL, OF LONG ISLAND CITY,

PATENT OFFICE.

NEW YORK, ASSIGNOR T ANCHOR CAP 82',

CLOSURE CORPORATION, OF LONG ISLAND CITY, NEW YORK, A CORPORATION OF NEW YORK.

DOUBLE-LOCK SCREW CAP.

Application filed May 11,

To all whom it 972,04 concern.

Be it known that I, AimAHAM Poonn, a citizen of the United States, residing at Long Island City, in the county of Queens, State of New York, have invented certain new and useful Improvements in Double- Lock Screw Caps, of which the following is a specification.

This invention relates'broadly toclosure caps and more especially to closure caps of the interrupted thread type.

Heretofore in the art interrupted thread caps have been formed of such construction that the interlocking helical members retained the cap in position on the container and these same members also retained the caps against rotation, by the friction of the helical member upon the lugs or threads on the jar. The shipment or handling of these jars in any such manner as to cause the contents thereof to exert pressure against the cap tended to slightly stretch the lugs and to relieve the pressure exerted by the lugs on the gasket thereby reducing the friction so that the cap would be loosened and would tend to come off. A

In the interrupted screw thread lug type of caps it is necessary to provide against over-running the cap on the threads to prevent the lugs from sliding over the projections on the bottle or jar which would cause the seal of the cap to be lost. This is especially true where these caps are applied by machinery.

The present invention overcomes the difiiculties of the known art byp-roviding separate members which cooperate to produce the combined result of locking the cap tightly on jar and at the same time tending to prevent any liability of the cap being loosened in handling during shipping or the overrunning of the cap .when the capis applied by suitable machinery. These ends may be accomplished by several types of construction but in the preferred form it is brought about by friction members of radial orcircumferential wedge-shaped cont-our arranged in the skirt of the cap and adapted to cooperate with con uously formed members on the finish o the jar. These members on the cap and jar cooperate to produce radial forces. Lugs are provided on the skirt of the cap to produce downward forces against a suitable gasket when the 1923. Serial No. 638,251.

lugs are turned under helical projections on the finish of the jar.

Having generally-described the invention it may be stated that the principal object of the invention is to provide a lug cap with lugs for sealing the cap and separate coacting friction means cooperating to prevent rotation of the cap.

A more specific object of the present invention is a closure cap of the character specified in which locking lugs and friction members are associated on the cap and jar in such manner as to produce vertical clamping pressure against the gasket within the cap and radial pressure to produce friction to prevent accidental backward rotation of the can to unseal the same.

. Other and further objects of the present invention will in part be obvious and will in part be pointed out in the speclfication following by reference to the accompanying drawings forming a part thereof.

It is recognized that the present invention may be embodied in constructions other than those specifically shown in the drawings and described in the specification, so therefore the disclosure herewith is to be considered as illustrative and not in the limiting sense.

Figure 1 is an elevational view of a cap embodying one form of the present inven tion.

Figure 2 is a perspective view illustrating the under portion of a cap similar to the cap shown in Figure 1 with the addition of knurled zones on the cap.

Figure 3 is a plan view looking at. the bottom of the cap shown in Flgure 1.

Figure 4 is a sectional view on line 4--4= of Flgure 1.

Figure 5 is a sectional view of the cap on line 5- 5 of Figure 4, and showing the top of the jar in plan.

Figure 6 is a View illustrating the fiIllSl'l on a jar adapted to cooperate Wlth the present cap.

Fi re 7 is a s'ectionalview on line 77 of Figure 3 looking in the direction of the arrows.

Referring now more especially to the drawin the cap comprising one embodlment 0 the present invention s provided with a. cover portion 1 from which depends a skirt 2 that may be either rounded or substantially cylindrical. This skirt may be plain, as shown in Figure 1, or portions thereof may be knurled as at 4 as illustrated in Figure 2. Friction members may be provided in the side wall of the skirt and preferably are in the form of relatively long Wedge-shaped indentations -5. That is, the wedge-shape is formed by short grooves which gradually deepen from the normal wall of the cap to a relatively deep portion adjacent one end of the groove to form spiral faced holding members. Locking lugs 6 are provided in the skirt of the cap and preferably adjacent the indentations 5. These locking lugs may be formed on the edge of the skirt or in any well known manner in the art. This cap is adapted to cooperate with a jar or wide mouth bottle 7, the finish 8 of which may be provided with projections 9 which preferably extend outwardly from the normal cylindrical finish, as wedge-shapedspiral faced members, with the wedge portions being oppositely inclined to the wedge indentation 5 on the cap. The under ortions of the projections are helically inclined as at 10 to provide a plurality of quick threads adapted to cowhen the cap is placed on the jar and turned in a clockwise direction. The cap preferably carries a gasket 11 of paper board or other suitable gasket material so that when the cap is tightened on the jar by rotating the cap in a clockwise direction the gasket is compressed between the mouth of the jar end 12 and the top 1 of the cap.

The sealed package formed by this cap is a secure one because there are two types of seals exerted in the sealing operation, one being a radial force seal which exerts resilient pressure a ainst the projections on the jar because t e cylindrical portion of the cap 14 tends to slightly flatten or stretch when the indentations 5 ride over the wedge-shaped projections 9. The other sealing force is one where the locking lugs.

sliding under the helical faces on the projections draw the cap tightly down on the gasket. While these two forces cooperate to produce a secure seal, the forces in a certain sense are independent of each other, and it is possible to loosen one of these seals without afi'ecting the other, which is capable of functioning to maintain the cap securely locked in position on the jar to form the completely sealed package. This makes a double security against accidents caused by the caps coming off during handling or shipping.

masses Having thus described my invention, what I claim is:

1. A closure cap comprising a cover portion, a skirt depending from said cover portion, a plurality of wedge-shaped locking members formed in the side wall of said skirt and adapted to exert radial force, and a plurality of locking lugs adjacent the edge of said skirt and also adjacent said locking members.

2. A closure cap comprising a cover portion, a skirt dependingfrom said cover portion, a plurality of wedge-shaped locking members formed in the side wall of said skirt and adapted to exert radial force, yielding resilient portions between the said members, and a plurality of locking lugs adjacent the edge of said skirt and also adjacent said locking members.

3. A closure cap of the quick-thread type comprising a cover portion, a skirt depending from said. cover portion, holding means having spiral faces and adapted to exert a radial force when said cap 1s applied, and locking lugs adapted to exert an endwise force to clamp said cap on a suitable container. operate with the locking lugs 6 on the cap 4. A closure cap comprising a cover portion, a skirt depending from said cover portion, lockin lugs on said skirt adapted to cooperate wlth a suitable container to lock said cap on the container, and yieldin means comprising a plurality of s ira faced members on said cap adapted to old said cap against rotation when said cap is seated on said container.

5. A package comprising the combination of a container provided with wedge-shaped lugs extending outwardly from the finish of said container, and a closure cap having a cover portion and a skirt, said skirt having wedge-shaped projections adapted to cooperate with the wedge-shaped members on the finish of the glass to retain said cap against rotation.

6. A package comprising the combination of a container provided with a plurality of wedge-shaped spiral faced lugs extending outwardly from thefinish of said container, and a closure cap having a cover portion and a skirt, said skirt having wedge-shaped spiral faced projections adapted to cooperate with the wedge-shaped spiral faced members on the finish of the glass to retain said cap against rotation, the direction of extension of the members on the cap being opposite to the direction of the members on the container.

ABRAHAM PODEL. 

